Bull&#39;s-eye.



N0. 798,656. PATENTED SEPT. 5, 1905.

C. B. BOSWORTH.

BULLS BYE.

APPLICATION FILED 11.4.1904,

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No. 798,656. PATENTBD SEPT. 5, 1905. G. B. BOSWORTH.

BULLS BYE.

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'UNTEB STATES PATENT YFFICE.

CHARLES B. B()S\V()R'l`ll, OF BONNEVILLE, MASSAtfIIUSIGT'IS, Az

T() STAR BRASS MAYUFAUTURING COMPANY, (llF BOSTON,

SSIGNOR MASSA- BULLS-EYE.

Specification of Letters Patent.

fatog'itezl 5329i. 5, 1905.

Application filed April 4, 1904. Serial No. 201,404.

Beit known that .LGiLxnLi-:s B. Boswoirrn',a citizen ot' the United States, residing at Somerville, in the county of liddlesex and State ot` Massachusetts, have invented a new and usct'ul Improvement in Bulls-lilyes, ol which the following isa tull,clear,aml exact description, reference being' had to the accompanying drawings, forming a partot' this specification, in explaning its nature.

My invention relates to an improvement in bnllseyes or sights especially adapted for lubricators or other devices in which the lubricator is subjected to high internal pressure. Yln the bulls-eyes hitherto made Ator these purposes the glass or transparency has heen sealed by packing, washers, or other mode of rein forcement. Such packing or sealing ot' the glass is always a source ot' trouble. 'lhe nature of the reinforcement is usually such that it is very susceptible to wear, and theI action otl the high pressure upon it is also extremely bad, especially when the bulls-eye or sight forms a part ot' a lubricator or other device used in connection with an engine or boiler running under very high pressure.

My invention accordingly consists in a form ot' bulls-eye which is not only very simple in its construction and absolutely unbreakable, but the glass ortransparency needs no sealing, packing, or other reinforcement to keep it tight and secure, whatever the internal pressure may be.

ln the drawings l have shown for the purposes ot' illustration the improved bulls-eye or sight applied to a lubricator to which it is especially applicable.

Figure l shows the lubricator in t'ront elevation titted with my improved `form o't' bullseye or sight. FigQshows thesanie in vertical cross-section on the line 2 Q ot' Fig. l. Fig. B shows the same on the line 3 3 of Fig. l. Fig. t shows in detail a cross-section of the improved bulls-eye or sight. Fig. 5 shows in cross vertical section a portion of an old t'orm ot' lubricator fitted with the saine.

ln the drawings, A represents the body or shell ot thelubricator,containing an oil-chamber u and one or more water-columns n', through which the oil is fed. ln the toi-mot' lubricator illustrated, which is one especially adapted to be used on a locomotive, three ot' these water-columns are shown, two for the has a body /f and head o.

t'eed ot' oil to the cylinders and the third for the feed of oil to the air-brake. The lubricator shown is also one acting' on the wellknown Siebert principle, in which the oil in the oil-chamber is kept under lmiler-pressure and t'ed in drops or globules up through the water-columns, the water in which is also under pressure.

4Set into the shell ot' the lubricator are a series ot lmlls-eycs B, one bulls-eye being' set into that portion ol the body oli the lubricator forming a part ot' the oil-chamber, by which bulls-eye an internal sight may be taken t'or determining the amount ot' oil in said chamber. The bulls-eye is set, prel'erably` nearthe top of the chamber in order that the line or level showing the amount ot' oil therein may show only when the oil in the chamber is approaching exhaustion, t'or in this type ot' lnbricator the oil lloats upon the water which [ills that portion ol the oil-chamber not containing` oil, the operation being' also such that water will enter the oil-chamber to take the place o l' the oil t'ed away, with the eti'ect that the line ot' oil and water gradually rises as the oil feeds away, the line showing near the top of the lubricator or in line with the bulls-eye B when the oil is nearly exhausted. Sights B are also set into other portions ot the shell or body of the lubricator at the ends ot or in passages (12, leading from the outside into the respective water-columns, by which a sight may be taken inside the same and the Vfeed ol the oil therein be seen` 1p1-eter that the passage 12 be extended directly through the bodyV and back and so a sight be taken directly through the water-colunm when the globule ot' oil rising therein may clearly be seen.

lVith reference now more especially to the structure ot' the new form ot' bulls-eye or sight B, it comprises a hollow plug carrying a glass or other transparency lhe plug 0n the outside ot' the body portion ot' the plug' are cut threads ff, by which it may be screwed or litted into the shell or wall ol the lubricator or other device or of any chamber or passage where a sight is needed. '.lhese threads are cut, pret'- erably, near the head /f ot' the plug' in order IOO that the head may be seated when the plug has been screwed into place and overlapping may protect the joint so obtained. The head of the plug' is also provided with cross-slots 7;, by which a wrench or other instrument may be applied to the plug' to screw or unscrew it.

rlhe plug I; is made of some considerable length and the glass also is very thick. The hollow internal of the plug is made tapered, its interior surface 7) tapering inwardly from the inner end of the plug toward its head, there being formed a relatively long, tapering, and preferably conical recess or pocket into which the glass fits. The glass is made to lit into the recess or pocket prepared for it in the plug' by reason of its being' properly sized and externally tapered to correspond with the internal taper of the plug' and to thereby fit contiguously the internal surface thereof. It is also to be noted that the glass is so thick and iits into the hollow of the plug so that its larger end 727 comes about fiush with the inner end of the plug, while its smaller end bs sets somewhat in from the head of the plug, so as to be protected thereby.

The essential utility of the new form of bulls-eye or sight resides in the fact of its Very simple structure, its absolute unbreakability, and especially the fact that no sealing, packing', or other reinforcement need be used to keep the glass tig'ht, for the plug made long as it is and the g'lass thick, to t as it does into the plug', there is provided a considerable extent of bearing or contacting surface between the external surface of the glass and the internal surface of the plug', which continuity of surface not only holds the g'lass in place, but makes also a tig'ht joint. In other words, the glass is self-sealing into the plug. To express this utility in further detail, the plug on the outside, by meansof its threaded connection and overlapping head, makes a perfectly tight joint which practically cannot be disturbed however high the pressure may be from within. Then the glass itself, carried by the plug, is so set in and protected by the head of the plug that it cannot be broken by a blow from without, and its very thickness and the manner of its bearing against the plug supporting it gives absolute surety against breakage from within. Then with the parts so constructed and relatively disposed the glass may be made to fit perfectly tight into the plug without the aid of washers or packing', with the effect that the higher the pressure the more tightly will the glass be held in place, for theparts combining' as they do the large end of the glass will be exposed to the pressure on the inside, with the eii'ect that the higher the pressure the more the glass will be pressed into its socket and the more tightly it will be held in place. Moreover, a sight of the kind just described has much utility by reason of the fact that its glass can easily be taken out and cleaned. The glass is extremely likely to become blurred by the deposit of dirt or sediment in the fit-ting, and unless the glass can readily be cleaned the eiliciency of the sight is much impaired. With my improved sight, however, each glass can be taken out and cleaned simply by unscrewing' the plug which carries it.

A bulls-eye or sight made in the manner described, besides its efiiciency in a lubricator, as said before, may of course be used in other capacities for inspecting the conditions, position, or operation of any matter or medium under high pressure.

In Fig'. 5 I have shown the new form of bulls-eye or sight applied to an old form of lubricator or one which has hitherto been supplied with tubular glass sights. The application is by means of a litt-ing which is simply inserted in place of the glass tube before used. It comprises a chambered member C, having members c and c', by which it may be joined to the body of the lubricator, and in this connection it is to be noted that the member c is made a screw member in order that the fitting may be inserted, while the member c may be cast integrally with the member C, as shown. The connecting members c and c are made of thesame size andshape as the glass tube before used, so that the same connections may be made without new or extra part, the connection usually comprising a screw-washer c2, reinforced by packing c3. Both members o and c/ are made hollow, and they, with the interposed cham bered member C, simply form a water-column for the entry of oil or water just as the tubular glass did; but the sight instead of being taken through the glass is taken through the bulls-eye B, which is inserted in the forward end of the member C, made to receive it. Owing' to the interference of the body of the lubricator a bullseye could not be used at the rear end of the member C in line with the forward bulls-eye, so that the sight could be taken directly through the member, as might be the preferred construction. Instead a reflector 0*, preferably of some white substance, is placed in the rear of the member C in line .with the bulls-eye, against which reiiector a sight may clearly be taken.

Having thus fully described my invention, I claim and desire to secure by Letters Patent of the United Statesl. A bulls-eye or sight of the character specified, comprising a relatively long, solid, hollow plug, tapered inwardly from the inner end of the plug toward its head, and combined therewith, a thick, solid transparency fitting within the hollow of the plug, said transparency being made externally tapered to correspond with the internal taper of the plug for combining contiguously with the internal surface thereof so as -to be held thereby, and

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whereby, also said transparency and plug,` will he Self-sealing'.

2. A bulls-eye or sight ot' the character Specified, comprising' a relatively long', solid, hollow plug', on the outside provided with threads, whereby it may be serewed into any [ixture ot' Support, and on the ineide made tapered inwardly from the inner end ot' the plug toward its head, and combined therewith, a thick, Solid transparency litting within the hollow ot' the plug', Said tranepareney be ing made externally tapered to correspond with the internal taper of the plug' for coinbining eontiguously with the internal enrfaee thereof so to be held thereby, and whereby, also said transparency and plugl will be Self- Sealing.

A bulls-eye or sight of the character speeilied, comprisingl a solid plug,l having' body and head portions, said body ot' the plug' heing made relatively long;` and threaded on the outside` whereby said plug' may be Screwed into any lixture ot' support, Said plug also being made eonieally tapered inwardLv freni the inner end ot' the body of the plug' toward its head, and combined therewith a thick, solid transparency set within the hollow ot' the plug` and Slightly in from the head thereof, said transparency being' made also externally tapered to correspond with the internal taper of the body ot' the plug so as to eoinbine eontiguously with the internal surface thereof, and whereby said transparency and plug' will be self-sealing'.

CHARLES B. BOSWTORTH. lVitnesses:

Jou-N E. R. HAYES, J. M. DoLAN. 

